KDS Model Technologies KDS-7XII RADIO CONTROL SYSTEM User Manual 11
Shenzhen KDS Model Technologies Co., Ltd RADIO CONTROL SYSTEM 11
Users Manual
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Contents
Contents...................................................................................................................................... 1
Introduction ................................................................................................................................ 2
Liability Declaration ................................................................................................................... 2
Precaution of Safety .................................................................................................................... 2
Part 1 Quick Start........................................................................................................................ 3
1. Mounting of Receiver ...................................................................................................... 3
2. Connect Devices to Receiver............................................................................................ 4
3. Binding Transmitter and Receiver .................................................................................... 4
4. Control Distance .............................................................................................................. 5
Part 2 User Manual...................................................................................................................... 5
1 Features............................................................................................................................ 5
2 Transmitter Panel.............................................................................................................. 6
3 Batteries Charging ............................................................................................................ 7
4 Stick Adjusting ................................................................................................................. 8
5 System Setting.................................................................................................................. 8
6 Helicopter Mode............................................................................................................... 8
6.1 Reverse Setting .................................................................................................... 10
6.2 End Point Adjustment........................................................................................... 11
6.3 Sub Trim Setting .................................................................................................. 11
6.4 Dual Rate Setting ................................................................................................. 11
6.5 Exponent Setting.................................................................................................. 12
6.6 Throttle Holding Setting ....................................................................................... 12
6.7 Gyro Sensitivity Adjusting.................................................................................... 13
6.8 Aux Channel Setting............................................................................................. 13
6.9 Throttle Curve Setting .......................................................................................... 14
6.10 Collective Pitch Curve Setting ............................................................................ 15
6.11 Swash Plate Setting ............................................................................................ 15
7 Aero Mode...................................................................................................................... 15
8 V-tail Mode..................................................................................................................... 16
8.1 V-tail Mix control Setting ..................................................................................... 17
9 Delta Wing Mode............................................................................................................ 18
9.1 Delta Wing Mix Control Setting ........................................................................... 19
10 Model Switch ............................................................................................................... 19
11 Stick Trim ..................................................................................................................... 20
12 Throttle Warning........................................................................................................... 20
13 IDLE Warning .............................................................................................................. 21
14 Countdown Timer for Throttle....................................................................................... 21
15 No Control Protection ................................................................................................... 22
16 Using PPM Signal......................................................................................................... 22
17 Change Transmit Frequency.......................................................................................... 22
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Before using this product, check that you have all of the following items. If any items are missing,
please contact your dealer.
Introduction
Thank you for purchasing KDS-7XII Radio Control System (hereafter called K-7XII). This
system is extremely versatile and may be used by beginners and professionals alike. In order for
you to make the best use of your system and to fly safely, please read this manual carefully. If you
have any difficulties while using your system, please contact your hobby dealer.
Liability Declaration
KDS model has the right to change the product, including the exterior, the functions parameter,
and use request, but no notice.
KDS model does not provide any guarantee, declaration and promise for special use of any KDS
products.
The recommended or text technologies data in the technology introduction for KDS model only
indicates the test result at that time, but it does not mean KDS model acknowledges the result in
law.
KDS model will not be responsible for the result made by using any product or circuit, including the incidental or
indirect compensation.
The parameters of KDS electronic products will be changed under different conditions. The
products will work only after all the functions parameters are approved by each use intension.
Precaution of Safety
It requires professional skills and technical knowledge to install and operate R/C model
properly. Incorrect installation and operation will result in severe property loss and personal
injuries.
KDS-7XII is exclusively designed for civil use of R/C models. Don’t use it in any other
flying machines.
The governmence for R/C model is different in different place, therefore, please consult your
local regulatory body and follow the rules and regulations to operate legally.
Radio wave transfers almost in straight routine in 2.4GHz, please make sure there is no any
obstacle when you are operating the product. The antenna tube should point at the controlled
model to ensure efficient control, and keep conductive materials away from receiver and
transmitter.
If there is prang, collision, welter and other accidents when operating, please test all the
things before next operating.
Always keep electronic components away from small children.
Stop flying long before your batteries become low on charge. Do not rely on your radio's low
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battery warning systems, intended only as a precaution, to tell you when to recharge. Always
check your transmitter and receiver batteries prior to each flight.
Before flying, be sure that the frequency you intend to fly with is not in use, and secure any
frequency control device (pin, tag, etc.) for that frequency before turning on your transmitter.
It is never possible to fly two or more models on the same frequency at the same time. Even
though there are different types of modulation (AM, FM, PCM), only one model may be
flown on a single frequency at any one time.
While you are getting ready to fly, if you place your transmitter on the ground, be sure that
the wind won’t tip it over. If it is knocked over, the throttle stick may be accidentally moved,
causing the engine to speed up. Also, damage to your transmitter may occur.
Before taxiing, be sure to extend the transmitter antenna to its full length. A collapsed
antenna will reduce your flying range and cause loss of control. It is a good idea to avoid
pointing the transmitter antenna directly at the model, since the signal is weakest in that
direction.
Don’t fly in the rain! Water or moisture may enter the transmitter through the antenna or stick
openings and cause erratic operation or loss of control. If you must fly in wet weather during
a contest, be sure to cover your transmitter with a plastic bag or waterproof barrier. Never fly
if lightning is expected.
Part 1 Quick Start
KDS-7XII IS ADVANCED ELECTRONIC DEVICE, AND FEATURES WIDE USE. It can
support multi-users and multi-equipment simultaneously, and features quick response, high
precision, and strong capability for anti-jamming.
KDS-7XII supports one transmitter and several receivers, and makes it possible that single radio
can control several models.
KDS-7XII supports different brand gyros.
KDS-7XII reacts quickly and precisely.
1. Mounting of Receiver
Installation position shall follow these conditions:
1. Keep the receiver away from engine, motor, ESC, battery, and other metal parts.
2. The antenna can not be covered by metal, carbon material or other electronic conduction
materials.
Keep the antenna in 90 degrees with installed frame or bottom plate, which means that trying to
keep the antenna visible.
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2. Connect Devices to Receiver
Connect all devices and parts to the corresponding channels. Take notice of 3P signal wire must be
connected in right way. Otherwise, it will cause the severe damage to certain device or fail to work.
There are some corresponding symbols of 3P on one side of the receiver:
(-) means cathode of power connected to the earth, usually links to the black line or brown
line of 3P signal wire
(+) means the anode of power, usually links to the red wire of 3P signal wires.
(s) means signal wire, usually links to the white or yellow wire of 3P signal wires.
Notice: please assess the power demand of the receiver of model when selecting the electricity
supply style, ensure the receiver can get enough power supply when using, the voltage of the
receiver not less than 4.2V at any time.
3. Binding Transmitter and Receiver
Before using K-7XII, you must bind the transmitter and the receiver. Binding them as following
steps:
1) Plug the 'BIND line' into the 'BIND' slot of receiver. Then power on receiver by plugging the
ESC line, then the LED of receiver will flash fast. Then you can remove the 'BIND line'.
2) Hold 'ESC' button of transmitter, then turn on it (keep holding), the LCD will display as
following.
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3) After few seconds, binding will finish, the LED of receiver will shine three times slowly,
and then the transmitter enters working mode.
4) Release 'ESC' button of transmitter, it will enter working mode.
Notice:
1) KDS-7XII supports multiple receivers operation and long-distance binding, so please make sure
only you bind the radio at that time. If there is any person who also uses KDS-7XII 2.4GHz
remote controller system locally, please operates only after other users pare the signal.
2) KDS-7XII supports seven models saving in one transmitter. They are numbering as M/1 to M/7.
The binding will save the serial numbers in receiver. So if you bind one receiver with M/1, it
can only work when the transmitter is switched to M/1.
4. Control Distance
All radio control system equipment has an effective control range. It’s not the same on the ground,
water surface or flying in the sky; It is not the same on flat ground or complicated layout; It’s not
the same in rainy days or sunny days; And besides, the external electrical environment is changing
continuously. It’s quite necessary for the users who want to control at a long distance to test
effective distance beforehand.
Radio wave transfers almost in a straight line, please make sure there is no object between antenna
and the controlled model. And the antenna should point at receiver’s antenna, and keep the
controlled model in certain distance where you can see the model.
Part 2 User Manual
1 Features
1.LCD display
2.Support 7 models parameters store
3.Support 5 points throttle (THR) curve in NORMAL mode and IDLE mode.
4.Support 5 points pitch (PIT) curve in NORMAL mode, IDLE mode and HOLD mode.
5.Support HELI (helicopter) mode and AERO mode. Following modes are supported in each
mode:
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HELI mode
HP1: Normal helicopter with 1 servo
HP2: Swash helicopter with 2 servos
HP3: CCPM 120°swash helicopter with 3 servos
AERO mode
A/P : Normal aero plane
V/P : V-tail plane
D/P : Delta wing plane
Table1 - Model type list
6.7 channels standard servo signal output
7.Support Dual rate (D/R) control
8.Support throttle hold
9.Support gyro sensitivity adjusting
10.Battery low voltage warning (voltage can be set).
11.Throttle stick position warning
12.Countdown timer for throttle
13.No signal protection
2 Transmitter Panel
Figure 1 - Transmitter panel
DR
HOLD
STICK
STICK TRIM
INC
ESC
MENU
UP
STICK TRIM
LCD DISPLAY
STICK
HOOK
IDLE
GEAR
POWER SW
POWER LED
RF LED
DN
DEC
ANT
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Switch & Button
Description Detail
IDLE
In HELI mode, it is used to switch NORMAL mode
and IDLE mode. In AERO mode, it controls
channel6.
See
section-6.9
section-6.10
section-7
DR It is used to control dual rate of aileron, elevator and
rudder. See section-6.4
HOLD THR hold switch. See section-6.6
GEAR In AERO mode, it controls channel 5.
In HELI mode, it controls channel 7.
See section-7
See section-6.8
UP Page up button
MENU Menu button
DN Page down button
INC Increase button
ESC Escape button
DEC Decrease button
Table2 - Button list
3 Batteries Charging
If you are using NiCd or NiH batteries, you can charge it with a external power without getting
batteries out.
You can find the power slot in the right side of transmitter. Connect plug properly to charge shown
as Figure2.
Figure2 - External Power
Warning: The power should be 11.6V, the current should be at least 50mA. Other style may
be dangerous!
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4 Stick Adjusting
To adjust the stick length, use 1.5mm inner hexagon screw driver to unlock the set screw. Turn the
screw driver counter-clockwise to loosen the screw. Then, turn the stick clockwise to shorten or
counter-clockwise to lengthen. After the control stick length have been adjusted to suit your flying
style, tighten the set screw.
Figure3 - Stick Adjusting
5 System Setting
Hold MENU button and turn on transmitter, it will enter system setting mode, and the first item is
shown like following:
Figure4 - System setting interface
There are 6 items "MOD", "STK TYP", "BAT WAR", "BAT MIN" and "BAT MAX".
Press MENU to change setting item as Table3
Press UP or DN to choose model as Table3 when in MOD setting
Press INC or DEC to change setting contents, or change "Model Type" when in MOD setting.
Press ESC to save and exit system mode.
Item name Description Content
Model selection
(By pressing UP/DN )
Support 7 models, see Section-10
MOD Model type selection
(By pressing INC/DEC)
A/P : Normal aero plane
V/P : V-tail plane
D/P : Delta wing plane
HL1: Normal helicopter with 1 servo
HL2: Swash helicopter with 2 servos
Item name
Setting content
Model no
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HL3: CCPM 120°swash helicopter with 3
servos
STK
TYP Stick mode
1 USA hand
2 JPN hand
3 Anti USA hand
4 Anti JPN hand
BAT
WAR Voltage for battery warning
BAT
MAX Battery indicator high limit
BAT
MIN Battery indicator low limit
ID
GEN Regenerating ID of transmitter See section 17
Table3 - Details of system setting
6 Helicopter Mode
HP1, HP2 and HP3 are HELI mode. In this mode, the LCD will display like following:
Figure5 - HELI mode
In HELI mode, the corresponding content of each channel shown in Table4.
Channel Control Description
1 AIL Aileron
2 ELE Elevator
3 THR Throttle
4 RUD Rudder
5 GY Gyro
6 PIT Pitch
7 AUX Auxiliary
Table4 - HELI Channels list
Press MENU will enter setting mode. In HELI mode, there are 11 items can be set, see
Table5. During setting, you can press MENU to change settings, or press ESC to exit setting
and return to using mode.
Press UP or DN can switch the display "Model status" between "Model no" and "Model type"
Model status
Battery voltage
Mix control status
Throttle timer
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Press INC or DEC can modify the "Throttle Timer"
Index Caption Description
1 REV Channel reverse setting
2 EPA End point adjustment
3 TRM Channel sub trim setting
4 D/R Dual rate setting
5 EXP Exponent setting
6 HLD Throttle hold setting
7 GYO Gyro sensitivity adjustment
8 AUX Aux channel setting
9 THR Throttle curve setting
10 PIT Collective pitch curve setting
11 PLA Swash plate setting
Table5 - HELI mode settings
In HELI mode, there are 4 flying status:
Mix control status Description
dR1 Rate 1 Rate 1 of dual rate
dR2 Rate 2 Rate 2 of dual rate
HLD Hold Hold mode
IDL Idle Idle mode
Table6 - HELI Channels list
6.1 Reverse Setting
Press UP or DN to change channel index from "CH1" to "CH7".
Press INC or DEC to modify the reverse status.
Figure6 - Reverse setting
Channel index
NOR: normal
REV: reverse
Menu caption
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6.2 End Point Adjustment
Press UP or DN to change channel index from "CH1" to "CH7".
Press INC or DEC to modify the value between "0" to "+120".
Figure7 - End point adjustment
6.3 Sub Trim Setting
Press UP or DN to change channel index from "CH1" to "CH7".
Press INC or DEC to modify the value between "-100" to "+100".
Figure8 - Sub trim setting
6.4 Dual Rate Setting
DR switch control the dual rate of aileron, elevator and rudder. And the rate of aileron, elevator
and rudder can be set independency.
Press UP or DN to change channel index between "Ail", "Ele" and "Rud" as Table6.
Press INC or DEC to modify the value between "0" to "+120". Default value is 100 for DR
SW=0, 60 for DR SW=1.
Channel index
End point value
Menu caption
Channel index
Sub trim value
Menu caption
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Figure9 - Dr for Ail setting.
Channel index Description
A/1 Ail rate when DR SW=0
A/2 Ail rate when DR SW=1
E/1 Ele rate when DR SW=0
E/2 Ele rate when DR SW=1
R/1 Rud rate when DR SW=0
R/2 Rud rate when DR SW=1
Table7 - Dual rate setting
6.5 Exponent Setting
Press UP or DN to change channel index between "Ail", "Ele" and "Rud".
Press INC or DEC to modify the value between "-45" to "+45".
Figure10 - Exponent setting
6.6 Throttle Holding Setting
Throttle holding will lock the throttle at setting value. In lock status, the throttle signal be not
changed even if the throttle stick is changed. It is controlled by HOLD switch. When HOLD
switch to 1, the throttle signal is locked (holding status), when HOLD switch to 0, the throttle
signal is normal (change by throttle stick).
Channel index
Dual rate value
Menu caption
Channel index
Exponent value
Menu caption
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Press UP or DN to change channel index between "Ail", "Ele" and "Rud".
Press INC or DEC to modify the value between "-20" to "+20", default is 0.
Figure11 - Throttle holding setting
6.7 Gyro Sensitivity Adjusting
There are two sensitivities for gyro. The gyro signal is one of the two values decided by IDLE
switch (see Figure1). The sensitivity value can be set between -100~+100. When it is greater than
0, the gyro is in head-lock mode, when the value is less than or equal to 0, the gyro is in non-lock
mode.
Press UP or DN to change channel index between "NOR" and "IDL".
Press INC or DEC to modify the value between "-100" to "+100", default is +100 for NOR
and -100 for IDL.
Figure12 - Gyro sensitivity setting
6.8 Aux Channel Setting
When in HELI mode, the GEAR switch controls channel 7, the AUX channel. There are two items
in AUX channel setting, SW1 and SW2, control the signal of AUX channel when GEAR switch in
different position.
Throttle hold value
Menu caption
Switch position
Gyro sensitivity
Menu caption
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Press UP or DN to change channel index between "SW1" and "SW2".
Press INC or DEC to modify the value between "-100" to "+100", default is +100 for SW1
and -100 for SW2.
Figure13 - Aux channel setting
6.9 Throttle Curve Setting
There are two throttle curves in KDS-7XII, one is for NORMAL mode, and the other is for IDLE
mode. Every curve has 5 points. Each point means the relation between signal and stick position
as Table8.
Press UP or DN to change channel index between "N/1" ~"N/5" and "I/1"~"I/5". "N?" for
NORMAL mode and "I?" for IDLE mode.
Press INC or DEC to modify the value between "0" to "+100".
Figure14 - Throttle curve setting
Point index Stick position Default signal value
N/1 I/1 H/1 Stick at lowest position 0
N/2 I/2 H/2 Stick at 25% position +25
N/3 I/3 H/3 Stick at center +50
N/4 I/4 H/4 Stick at 75% position +75
N/5 I/5 H/5 Stick at highest position +100
Switch position
Channel value
Menu caption
Curve point index
Curve point value
Menu caption
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Table8 - Throttle curve stick value
6.10 Collective Pitch Curve Setting
There are three collective pitch curves, the first is for NORMAL mode, the second is for IDLE
mode, and the third is for HOLD mode. Each point means a stick position like Table8.
Press UP or DN to change channel index between "N/1" ~"N/5" "I/1"~"I/5" and "H/1"~"H/5".
"N?" for NORMAL mode, "I?" for IDLE mode and "H?" for HOLD mode.
Press INC or DEC to modify the value between "0" to "+100".
Figure15 - Collective pitch curve setting
6.11 Swash Plate Setting
Press UP or DN to change channel index between "AIL" "ELE" and "PIT".
Press INC or DEC to modify the value between "-100" to "+100". Default value is +50.
Figure16 - Swash Mix control setting
7 Aero Mode
A/P is AERO mode. In AERO mode, the LCD will display like Figure17:
Curve point index
Curve point value
Menu caption
Swash dimension Mix control value
Menu caption
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Figure17 - Aero mode
In AERO mode, the corresponding content of each channel is shown in Table9
Channel Control Description
1 AIL Aileron
2 ELE Elevator
3 THR Throttle
4 RUD Rudder
5 GER Gear, control by GEAR switch
6 FLP Flap, control by IDLE switch
7 AUX Aux, control by D/R switch
Table9 - AERO Channels list
There are 8 settings in AERO mode, see Table10 for details. To change settings, the operations are
the same as the operations in HELI mode.
Index Caption Description
1 REV Channel reverse setting
2 EPA End point adjustment
3 TRM Channel sub trim setting
4 D/R Dual rate setting
5 EXP Exponent setting
6 HLD Throttle hold setting
7 GER Gear setting
8 FLP Flap setting
Table10 - AERO settings
8 V-tail Mode
V/P is V-tail mode. In this mode, the LCD will display like Figure18:
Model status
Battery voltage
Mixture status
Throttle timer
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Figure18 - Aero mode
The channels and switches are the same as in AERO mode, see Table9.
There are 9 settings in V-tail mode, see Table11 for details. To change settings, the operations are
the same as the operations in HELI mode.
Index Caption Description
1 REV Channel reverse setting
2 EPA End point adjustment
3 TRM Channel sub trim setting
4 D/R Dual rate setting
5 EXP Exponent setting
6 HLD Throttle hold setting
7 GER Gear setting
8 FLP Flap setting
9 MIX V-tail Mix control setting
Table11 - V-tail settings
8.1 V-tail Mix control Setting
There are four items in this setting: V1, V2, V3 and V4. The value is between -100~100, default
value is E>2=R>2=R>4=50, E>4=-50. The relationship between output signal and Mix control
parameters is shown in Table12.
Signal
Stick CH2 CH4
ELE stick E>2 E>4
RUD stick R>2 R>4
Table12 - V-tail signal
Pressing UP or DN will change setting from V1 to V4. Pressing INC or DEC will increase or
decrease the value. See Figure19.
Model status
Battery voltage
Mixture status
Throttle timer
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Figure19 - V-tail Mix control setting
9 Delta Wing Mode
D/P is Delta wing mode. In this mode, the LCD will display like Figure20:
Figure20 - Delta wing mode
The channels and switches are the same as in AERO mode, see Table9.
There are 9 settings in Delta wing mode, see Table13 for details. To change settings, the
operations are the same as in HELI mode.
Index Caption Description
1 REV Channel reverse setting
2 EPA End point adjustment
3 TRM Channel sub trim setting
4 D/R Dual rate setting
5 EXP Exponent setting
6 HLD Throttle hold setting
7 GER Gear setting
8 FLP Flap setting
9 MIX V-tail Mix control setting
Table13 - Delta wing settings
Model status
Battery voltage
Mixture status
Throttle timer
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9.1 Delta Wing Mix Control Setting
There are four items in this setting: A>1, A>2, E>1, E>2. The value is between -100~100, default
value is A>1=A>2=E>2=+50, E>1=-50. The relationship between output signal and Mix control
parameters is shown in Table14.
Signal
Stick CH1 CH2
AIL stick A>1 A>2
ELE stick E>1 E>2
Table14 - Delta wing signal Mix control
Press UP or DN to change channel index between "A>1", "A>2" and "E>1", "E>2".
Press INC or DEC to modify the value between "-100" to "+100".
Figure21 - Delta wing Mix control setting
10 Model Switch
KDS-7XII can support 7 models; each model has its own parameters. To switch among them, you
should enter system mode by holding MENU and turning on transmitter. The following screen
will be shown.
Figure22 - Model switch
Pressing UP or DN will switch from "-1-" to "-7-" which indicate each model. Press INC or DEC
will change model type. When some model is selected, press ESC to return to normal using mode.
Mixture index
Mixture rate
Menu caption
Model index
Model type
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Now the transmitter will load the parameters of your selection and all your settings will be saved
into the model you selected.
11 Stick Trim
When you pull buttons of stick trim (see figure 1), the screen will display as figure 23, and the
meaning of stick index refer to Table 15:
Figure23 - Stick trim
Stick index Description
R/H Stick of right and
horizontal
R/V Stick of right and
vertical
L/H Stick of left and
horizontal
L/V Stick of left and
vertical
Table15 - Stick index
12 Throttle Warning
KDS-7XII supports throttle warning. If the stick of throttle is not in the lowest position when the
Stick index Trim value
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transmitter is on, it will block in warning status. You will see "THRO" in screen and hear
continuously beep till you move the stick to the lowest position.
Figure24 - Throttle warning
13 IDLE Warning
KDS-7XII supports IDLE warning. If the IDLE switch on when power on, the transmitter will
block in warning status. You will see "IdLE" in panel and hear continuously beep till you switch
IDLE to off.
Figure25 - IDLE warning
14 Countdown Timer for Throttle
KDS-7XII has a countdown timer relate to throttle.
When in normal using status, you can see the timer on the center of screen. The default value is
five minutes, like Figure23. You can press INC or DEC to change the value.
When you push throttle stick up, the timer will run from the value you set to zero. After minutes
remaining, the transmitter will beep to notify you.
Throttle timer
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Figure26 - Throttle down timer
15 No Control Protection
KDS-7XII supports 'No Control Protection' function. You can predefine a set of values for each
channel. The receiver will use these values if it loses signal from transmitter.
To set the values, you should do as following steps:
1. Turn on the transmitter and receiver, bind them.
2. Adjust the transmitter, and make all channels to the position as you expect.
3. Hold ESC button until the screen of transmitter will display 'NCP' like Figure 27, and the RF
led shines, and the led of receiver will go out at the same time.
4. After 1 second, the transmitter and the receiver will restore to normal status, the defining of
'NCP' is done.
Figure27 - NCP setting
16 Using PPM Signal
There is a PPM signal output slot at bottom of KDS-7XII. When you plug the signal line into
the slot, KDS-7XII will switch to PPM status automatically and you will see following screen.
Figure 28 – PPM status
Notice: when the transmitter is in PPM status, the RF module will stop working, and then the
receiver will lost signal if it was power on.
17 Change Transmit Frequency
Electric interference may exist when using remote controller system. If it interferes with the
Notification
Notification
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frequency of your system, your devices will be out of control. Under these circumstances, you
can try to change the transmitter frequency by following steps:
1. Enter system mode by holding MENU and turning on transmitter
2. Press MENU several times to "ID GEN" function, you can see following screen
3. Press UP or DN to change the option to 'YES'
4. Press + or - to confirm the operation
5. The transmitter will regenerate the frequency and ID, and then the display will show 'OK'
and the transmitter will return to 'NO' status automatically.
Figure 30 – ID GEN menu
Notice:
1. The new frequency is selected randomly. If the interference still exists, you can try to
change it again until the interference disappears.
2. After the frequency changing, please rebind the radio.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions;
(1)this device may not cause interference,and
(2)this device must accept any interference received,including interference that may cause
undesired operation of the device.
Any changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.